Improved machine for millstone-dressing



UNITED STATES PATENT OFFICE.

WILLIAM A. DRYDEN AND JAMES H. MONTGOMERY, OF MONMOUTH, ILL.

IMPROVED MACHINE FOR MILLSTONE-DRESSING.

Specification forming part of Letters Patent No. 50,565, dated October 24, 1865.

To all 'whom it may concern:

Be it known that we, WILLIAM A. DRYDEN and JAMEs H. MONTGOMERY, of Monmouth, in the county of W'arren and State of Illinois, have invented a new and Improved Machine for Dressing Millstones; and we do hereby declare that the following is a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part ot' this specification, in which- Figure 1, Sheet No. l, is a front view of our invention; Fig. 2,aplan or top viewofthesame; Fig. 3, a transverse vertical section ofthe same, taken in the line x, Fig. 2.

Similar letters of reference indicate corresponding parts.

This invention relates to a new and improved machine for dressing millstones, and is designed to supersede the complicated machines hitherto devised for that purpose, and still perform the work more rapidly and in a more perfect manner than it can possiblyr be done by the old hand process.

The invention consists in arrangingr a carriage on an adjustable frame, with a rack, gearing,and pick-drivingmechanism,in suchamanner that by the turning ot' a single shaft the pick will be operated and fed along to its work, an arbitrary or positive movement being given the pick, so that the same will cut a unit'orm depth, but be capable ot' being graduated or set to cut to a greater or less depth, as may be required.

A represents what may be termed the base of the machine, which is a rectangular block having a dovetail-rabbet, a, in each end of it at its upper part to receive corresponding dove tail cleats or projections b b at each end of a rectangular frame or boX,B, which is iitted ou A to hold B in proper position on A aud admit of the former sliding freely forward and backward on the latter. This movement or adjustment ot B may be effected by means ot a' screw, G, which passes through a nut or female thread in the rear side of B, and has its bearing in an arm, D, on the rear of A. (See Fig. 3.)

On the upper partof the box B thereis placed a carriage, E, the latter being provided at its base with dovetail-cleats c c, to tit in dovetailrabbets d d at the front and rear side of B, said cleats and rabbets serving as guides for the carriage which moves in a longitudinal direction on B.

In the upper part of the frame or box B there is placed longitudinally and centrally a rack, F, and in the carriage E there is placed a driving-shaft, G, having upon it a pinion, e, which gears into a wheel, H, in the carriage, said wheel working in the rack F. By this means the traveling movement is given the carriage on the frame or box B.

In one end of the carriage E there is tted a vertically-sliding frame, I, operated as follows: In the upper part of said frame, in its rear side, there is a horizontal groove, j, in which a slide, g, is placed, and this slide has the wrist-pin h ot' a crank-pulley, J, attached to it, said pulley being on a. shaft, K, in the upper part of the carriage, which shaft has a fly-Wheel, L, and a pinion, M, upon it, the latter gearing into a spur-wheel, N, on the shaft G, previously described. By this arrangement the traveling movement of the carriage and the upand-down movementot the slidingframe I is obtained from the rotation ofthe shaft G.

In the sliding frame I there is tted a vertical bar, O, which is allowed to slide freely up and down, and is adjusted in that direction by means of a screw, l?. To the lower end of this bar O the pick Q is attached.

From the above description it will he seen that the pick is operated in consequence of being attached to the sliding frame I, and the depth of the cut ofthe pick may be regulated by adjusting the bar O higher or lower.

In using the device the front edge of the base A is placed in line with the furrow to he dressed and the shaft G turned, which operates the pick and also moves the carriage and feeds the pick along either to the right or left, according to the direction in which the shaft Gr is turned, the pick being adjusted farther forward or backward, so as to cut in parallel lines by adjusting the frame or box B through the medium of the screw C.

The device is extremely simple and ecient, may be used and manipulated with the greatest facility, and constructed at a very moderate cost.

Having thus described Our invention, We claim as new and desire to secure by Letters Patent-- l. Thecarriage E, provided with a verticallysliding frame, I, to which an adjustable pick, Ob, is attached, and also provided with gearing to engage with a rack, F, on the frame Or box B, and with a crank-pulley, or its equivalent, to Operate the frame I, all arranged in such a manner that by the turning of a single shaft, G, in the carriage the pick will be operated and fed along to its work, substantially as described. y

2. The giving ot'a positive motion to the piek through the medium of the crank-pulley J and slide g when combined with the adjustable carriage, substantially as described.

3. rlhe adjustable frame or box B, placed On WV. A. DRYDEN, JAMES H. MONTGOMERY.

Witnesses for Dryden:

'M. M. LIVINGSTON,

TI-IEO. TUscH. Vitnesses for Montgomery:

ELIAS WILLI'rs, J. T. MORGAN. 

